结合基与基离子的素结合:朝着选择性人口的基 σ-洞的易斯基
Loic Groslambert1, Yann Cornaton1, Patrick Pale1
1Institut de Chimie de Strasbourg, UMR 7177, CNRS, Université de Strasbourg, 4 Rue Blaise Pascal, Strasbourg F-67000, France.
The Journal of organic chemistry
|June 6, 2025
概括
这项研究表明,氨酸盐可以将多个氧化物分子与它们的σ孔结合,每增加一个分子的结合强度都会下降. 国家也在整体能源方面发挥着作用.
科学领域:
- 有机金属化学 有机金属化学
- 超分子化学 超分子化学
- 计算化学计算化学
背景情况:
- 泰 σ-洞是已知的易斯酸性网站,能够产生非共价相互作用.
- 了解对这些位点的顺序结合对于设计新型超分子组件至关重要.
- 在这种相互作用中, counterions 的作用往往是复杂的,需要详细的研究.
研究的目的:
- 为了研究鲁盐和氧化物之间连续的易斯酸相互作用.
- 描述由此产生的附加物,并了解结合热力学.
- 阐明 counterion 对整体 adduct 形成和能量学的影响.
主要方法:
- 对于结晶的易斯 adducts 的结构特征的X射线衍射.
- 扩散顺序的NMR光谱 (DOSY) 用于监测水力动力体积的变化.
- 异热定位热度计 (ITC) 用于确定约束常数和度.
- 密度函数理论 (DFT) 计算用于粘合分析和热化学.
主要成果:
- 选择性结晶的氧化添加剂与一个,两个或三个氧化连接体.
- 顺序结合常量 (Ka1 > Ka2 > Ka3) 随着连接体占用率的增加而显著下降.
- 在高阴离子分子大小的BArF- counterion聚合的证据.
- DFT分析证实了Te-O债券的主导库伦比特征,具有较小的共价贡献.
- 涉及BArF- counterion的离子对贡献显著影响协会度.
结论:
- 泰勒 σ-孔呈现渐进的易斯酸度,允许控制的顺序 adduct 形成.
- BArF- counterion 不是惰性的,并且参与离子配对,影响观察到的热化学反应.
- 这些系统的准确建模需要考虑对方参与协会过程.
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